i just bought a new multi printer and this is the first time i ever had 3 seperate color inks to buy. i'm getting a bulk supply of non-branded ink to keep on hand so i can save money but i don't know which colors will run out fastest. (magnetta, cyan, or yellow) black is no problem. assuming i want enough to replace all of them at least twice, how many will i need to buy? in other words just to start off with, how many of each color do i need till i get used to it? i don't do photos just color copying and text documents mostly. PS - i know everyones different but i just want a guesstimation here.